///*
// * Copyright 2019 The gRPC Authors
// *
// * Licensed under the Apache License, Version 2.0 (the "License");
// * you may not use this file except in compliance with the License.
// * You may obtain a copy of the License at
// *
// *     http://www.apache.org/licenses/LICENSE-2.0
// *
// * Unless required by applicable law or agreed to in writing, software
// * distributed under the License is distributed on an "AS IS" BASIS,
// * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// * See the License for the specific language governing permissions and
// * limitations under the License.
// */
//
//package com.gonsin.ta.logic.proto;
//
//import io.grpc.*;
//import io.jsonwebtoken.*;
//
///**
// * This interceptor gets the JWT from the metadata, verifies it and sets the client identifier
// * obtained from the token into the context. In order not to complicate the example with additional
// * checks (expiration date, issuer and etc.), it relies only on the signature of the token for
// * verification.
// */
//public class JwtServerInterceptor implements ServerInterceptor {
//
//  private JwtParser parser = Jwts.parser().setSigningKey(Constant.JWT_SIGNING_KEY);
//
//  @Override
//  public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(ServerCall<ReqT, RespT> serverCall,
//      Metadata metadata, ServerCallHandler<ReqT, RespT> serverCallHandler) {
//    String value = metadata.get(Constant.AUTHORIZATION_METADATA_KEY);
//
//    Status status = Status.OK;
//    if (value == null) {
//      status = Status.UNAUTHENTICATED.withDescription("Authorization token is missing");
//    } else if (!value.startsWith(Constant.BEARER_TYPE)) {
//      status = Status.UNAUTHENTICATED.withDescription("Unknown authorization type");
//    } else {
//      Jws<Claims> claims = null;
//      // remove authorization type prefix
//      String token = value.substring(Constant.BEARER_TYPE.length()).trim();
//      try {
//        // verify token signature and parse claims
//        claims = parser.parseClaimsJws(token);
//      } catch (JwtException e) {
//        status = Status.UNAUTHENTICATED.withDescription(e.getMessage()).withCause(e);
//      }
//      if (claims != null) {
//        // set client id into current context
//        Context ctx = Context.current()
//            .withValue(Constant.CLIENT_ID_CONTEXT_KEY, claims.getBody().getSubject());
//        return Contexts.interceptCall(ctx, serverCall, metadata, serverCallHandler);
//      }
//    }
//
//    serverCall.close(status, new Metadata());
//    return new ServerCall.Listener<ReqT>() {
//      // noop
//    };
//  }
//
//}
